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rosijanka [135]
3 years ago
7

A rectangle has a length of x + 9 and a width of x - 1. Which equation below

Mathematics
1 answer:
jolli1 [7]3 years ago
6 0

Answer:

A

Step-by-step explanation:

P = 2 (W+L)

P = 2 (x+9+x-1)

P = 2 (2x+8)

P = 4x+16

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Mary has a collection of nickels and quarters for a total of $4.90. If she has 42 coins in total, how many of each kind are ther
damaskus [11]

Answer:

14 quarters and 28 nickels

Step-by-step explanation:

System of Equations where x = number of quarters and y = number of nickels

(1) equation with value of each coin

    0.25(x)+0.05(y) = 4.90

(2) total number of coins

    x + y = 42

Solve system of equations using either substitution or elimination

(elimination multiplying equation 2 by -0.5)

.25(x) + 0.05(y) = 4.90

-0.05(x) - 0.05(y) = 42 * (-0.05)

(3) Resulting equation

.20(x) = 2.8

x = 14

plug x into equation 2

14 + y = 42

y = 28

There are 14 quarters and 28 nickels in Mary's collection.

5 0
3 years ago
What is the value of f(3) when f(x) = 4x + 1
valentina_108 [34]

Here is the equation:

f(x)=4x+1

You need to find f(3). To do that, substitute all the x's with 3:

f(x)=4x+1 \rightarrow f(3)=4\times3 + 1

The first thing you need to do is multiply 4 by 3. Multiply:

4 \times 3 = 12

Here is your new equation:

f(3)=12+1

To get your answer, you need to add 12 and 1. Add:

12+1 = 13

That means:

\bf f(3)=13

<em>If you have any questions, feel free to ask in the comments! :)</em>

3 0
3 years ago
Read 2 more answers
Explain how complex fractions can be used to solve problems involving ratios?
alisha [4.7K]
Complex fractions are numbers in which the numerator and the denominator are both fractions. in this case, to solve the ratio, we can multiply the numerator fraction by the reciprocal of the denominator fraction. Another way is to solve the fraction separately and then divide eventually. 
8 0
4 years ago
Easy points for fun whats 9 times 9
sleet_krkn [62]

Answer:

81

Step-by-step explanation:

8 0
3 years ago
the number is 57,733 contains two sets of digits in which one digit is ten times as great as the other. what are the values of t
Afina-wow [57]
In 57,733 the values are:

5 is for tens
The first 7 is for ones
The second 7 is for tenths
The first 3 is for hundredths
The second 3 is for thousandths

Two set of digit in which one digit is ten times as great as the other are 3 and 3, as well as 7 and 7

It's because 0,03 is ten times as much as 0,003 and 7 is ten times as much as 0,7.
8 0
3 years ago
Read 2 more answers
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